Subfertility caused by sperm motility defects have also been reported for male PCD patients with mutations in the radial spoke genes DNAJB13 (DnaJ heat shock protein family (Hsp40) member B13), RSPH3 (radial spoke head 3 homolog) and RSPH9 [13, 27, 37, 48, 62]. Here, DNAJB13 is linked to primary ciliary dyskinesia.